I'm the first to...wow, what a dubious honor. Here, I was able to reproduce the bug and this time I remembered to save the crash report.
Thanks, that's really helpful! Based on that error report, it may be that no-one has actually had all the children die since we released the "full" version of the game, lol. Perhaps the whole ending is broken.
EDIT: Ugh, looks like a recent update which enabled easy save-games causes a crash when converted using Pulpmill like this game is. I'll look into a fix.